Improvement in grain-drill teeth



i. H PALMER;

Seed-Drill Teeth.

Patented Nov. 3, 1863.

VZ Inventor:

Witnesses: n?

fli

NITED STATES PATENT ()FFICE.

IsAAo H. PALMER, or LODI, wrsoonsnn IMPROVEMENT IN GRAIN-DRILL TEETH.

Specification forming part of Letters Patent No.40,497, dated November 3, 1863.

To all whom it may concern;

Be it known that I, IsAAc H. PALMER, of Lodi, in the county of Columbia and State of \Visconsin, have invented a certain new and Improved Drill or Cultivator Tooth; and I do hereby declare the following to be a full and exact description of the same, reference being bad to the accompanying drawings, making part of this specification, in which- Figure 1 is a side elevation of a drill-tooth illustrating my invention. Fig.2 is a vertical longitudinal section thereof in the linemac, Fig.1. Fig. 3 is arear elevation of the same.

Similar letters of reference indicate'corresponding parts in the several views.

This device relates to that class of drill or cultivator teeth which are designed to pass over all immovably fixed or rooted obstacles in the soil by being so constructed that when the tooth meets an impediment it may be deflected backward and upward in such a man ner that the danger of injury or accident is avoided.

Myinvention consists in a novel, simple, and durable construction of drill-tooth, whereby the object above referred to may be more effectually accomplished, and the tooth, after passing an obstacle, automatically restored to its workingposition,as will be hereinafter fully described.

To enable others skilled in the art to which my invention appertains to fully understand and use the same, I will proceed to describe its construction and operation.

In the accompanying drawings, A B may represent a metallic conducting-tube of a seeding-machine formed in two parts jointed or pivoted together, as clearly shown in Fig. 2, by a pin or pivot, c, which is jour naled in a bracket, 0, and has its bearings in a box, D. The bracket 0 is rigidly affixed near the lower terminus of the upper section, A, at the back thereof, and the box D at the top of the lower section, B, by rivets d or otherwise, whereby a simple and durable knee-joint connection is formed.

E is a spring formed of a strip or plate of steel, which is fastened at the top of the section A by means of a clasp or band, F, and extends in a downward direction to the box D,

where it is held in proper position by a lip or thumb, d, formed upon the box D.

G G are pins loosely fitting within orifices in the spring E, and provided with'shoulders g, and G is a pin or projection, against which the spring E is pressed, whereby the said spring is secured from lateral displacement and adapted to exert a sufficient backward pressure upon thelip d to retain the lowersection, B, in the proper working position under ordinary circumstances, allowit to yield backward when the tooth or drill proper, H, strikes against an immovable obstacle, and restoreit to its operating position when such obstacle is passed.

'In Fig. 1 the red outline of the lower section,

B, represents it as yielding to an obstruction.

The section B constitutes the shank of the tooth H, which may be secured thereto in any desirable way.

It will be seen that a cultivator-tooth corn structed in the manner above described not only effectually performs its function, but that it can be manufactured at a considerable reduction in cost, and is much less complicated and liable to become choked than implements of this character heretofore in use.

I do not claim broadly the application to a yielding cultivator-tooth of a spring to restore it automatically to its working position, as I am aware that such springs have before been applied to cultivator'frames. I am also aware that springs have been applied to drill-teeth independently of the frame for a purpose different from mine. 1 do not, however, restrict myself to the particular form of spring herein described, nor to the manner of attaching it, but propose to modify the same in any way which experience may prove to be desirable, so long as the essential features and purposes herein specified be not departed from.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A drill or cultivatortooth jointed at or about its mid-length to permit it to yield backward in the event of striking an immovable obstacle, and provided with a spring attached directly to the tooth independently of the frame, for the purpose of throwing the tooth forward to its operating position when released, substantially as herein described.

' ISAAC H. PALMER.

- Witnesses:

OoTAVrUs KNIGHT, R. H. MAYHEW. 

